How to import python-file from another folder and sub-folder

Question

Now i'm working on Python 3.6.8, Now i'm got stuck about import file. It's can't work

├── db
│   ├── commit.py
│   ├── config.py
│   ├── database.ini
│   └── __init__.py
└── main.py

This my code structure. for each file ,

#commit.py 

from config import config 

class Commit():
     #many function
     #some process. Which use package from config

#config.py 

class config():
    #some process.

#database.ini 
#It's text file 

#__init__.py 
import commit 
import config

#main.py 

from db import commit 
from db import config 

class Main():
    #many function
    #include calling commit function 

if __name__=="__main__":
   #work with main function 

But my program still error. When i run main.py and This below is error message.

db/__init__.py", line 1, in <module>
import commit
ModuleNotFoundError: No module named 'commit'

Why it can't work? because is Python 3+ ? how to fix this.

Answer 1

The following structure should works:

# main.py
from db.commit import *
from db.config import *

class Main():
   #many function
   #include calling commit function 

if __name__== "__main__":
   #work with main function

I suppose that you need to import everything from commit and config file. But if you need just the Commit class or the config class you can modify code like the following:

from db.commit import Commit
from db.config import config

Then other files

# init.py
# no imports

Remove imports from init.py

# config.py
class config():
    #some process.

config.py it's fine like your version

# commit.py
from .config import *

class Commit():
    #many function
    #some process. Which use package from config

In this way should works correctly.

edit after comment

If from main.py, you import functions contained in commit.py module and in commit.py module you import functions contained in main.py module you will have circular imports.

In order to fix it you should organized the project structure in another way.
For example you can move Main class in another file and then import it in both, main.py and commit.py.